It’s why it’s important to pull Chait’s son-in-law test one step closer, and why he’s wrong that it’s unlike one’s sports team or religion. Our opinion of our kin’s moral character should be as affected as if they told us they were changing religion, or had a different sports team allegiance. Political party is no more a proxy for moral character than religion or sports team. I’d be disappointed if my child grew up a Nats fan (rather than an Astros fan) but it would be so inconsequential to my feelings toward my child that it wouldn’t really bear mentioning at all. (Caveat: I do not have children, so, er, grain of salt.)
It’d be the same if my child turned out to be a liberal. Liberals are, by and large, good people. I am related to a few of them! Their ideology is not noteworthy in the least if I were to discuss their moral character. And this would certainly go for anyone they’d choose to marry, as well.
What would be noteworthy? A lot of common sense things: a refusal to treat strangers with kindness and dignity, never working for charity, a selfish attitude that subjugates the feelings of others – it’s complicated to define what makes a bad person. Party allegiance is so low on the list of what defines good and bad that it might as well be sports allegiance or religion.